Online PHP editor | refs for NTFPM

<?php $arr = ['4', 'x' => 5]; // construct with duplicate keys var_dump(['x' => 4, 'x' => 6]); var_dump([2 => 4, 2.0 => 6]); // spread operator leading to duplicate keys var_dump(['x' => 4, ...$arr]); // destruct with duplicate keys ['x' => $a, 'x' => $b] = ['x' => 10]; var_dump([$a, $b]);